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Science 24 October 1997:
Vol. 278. no. 5338, pp. 650 - 653
DOI: 10.1126/science.278.5338.650
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Reports

Deformation in the Lower Crust of the San Andreas Fault System in Northern California

Timothy J. Henstock, Alan Levander, John A. Hole

A continuous seismic velocity and reflectivity cross-section of the San Andreas fault system in northern California shows offsets in the lower crust and the Mohorovicic Discontinuity near the San Andreas and Maacama strike-slip faults. These faults may cut through the crust to the upper mantle in a zone less than 10 kilometers wide. The northern California continental margin to the eastern edge of the Coast Ranges is underlain by a high-velocity lowermost crustal layer that may have been emplaced within 2 million years following the removal of the Gorda plate slab. The rapid emplacement and structure within this layer are difficult to reconcile with existing tectonic models.

T. J. Henstock and A. Levander, Department of Geology and Geophysics, MS-126, Rice University, Houston, TX 77005-1892, USA.
J. A. Hole, Department of Geological Sciences, Virginia Polytechnic Institute, Blacksburg, VA 24061-0420, USA.

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